Seiko Liner “Dragonfly Wing” Ref. 15010Model: Seiko Liner Dragonfly Wing Ref. 15010 Year: 1950s Features: The Origin. The Seiko Liner series is the result of the friendly competition between Seikos two main factories Daini and Suwa. Friendly in the sense both companies were owned by Seiko but jobs, prestige and promotions were always on the line. The resulting rivalry was fierce but the Hattori family never let it become bitter. The Factory. The Liner was the brainchild of the Suwa